Electric fields are all around us. In fact it is with every single piece of postive and negtive enegry out there. It is the space in between the particles. The electric fields concept was introduced by Michael Faraday. It is based on the fact that its the field between two electrical charges, in the same way a gravational field acts around two planets. An electric field is an invisible force field created by the attraction and repulsion of electrical charges, it comes from Newton's law of Universal Gravitation. The higher the unstable conditions the more energy and the higher the field becomes between the two particles. the fields show the interaction between the particls interaction with each other. Postive have field lines pointing in, the negitve are opposite with field lines pointing out. If you can understand gravity and mass, you can understand electric fields and potential, and how they interact with each other. [4] [6] [7]
What is Electric Potential
Image Courtsey of: Dannex
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Electric Potential is an idea from Electrostatics, it can be described as the capcity for doing work, which arises from the position or configuration of the particles. The units are called Vouls or Voltage (named after Alessandro Volta) as we know them. It is usually compared to gravity and mass. Another energy that is used, usually has to do with energy moving with a charge from one place to another. It is defined by a source that is multiplied by the force that is applied. The steeper the potential, the higher the electric field becomes. Potential also has regions which are know as equipotentials, which is the constant value. It can usually be calculated by the point charge expression.[5] [8] [9]
Vocabulary
Vector: A force or influence
Force Field: the space around a radiating body within which its electromagnetic oscillations can exert force on another similar body not in contact with it
Electric Fields: A region of space characterized by the existence of a force generated by electric charge.
Magnitude: relative importance or significance
Conductor: a substance, body, or device that readily conducts heat, electricity, sound, etc.:
Electrical Potential: The work which must be done against electric forces to bring a unit charge from a reference point to the point in question;
Voltage: Electromotive force or potential difference, usually expressed in volts
Volts: The International System unit of electric potential and electromotive force, equal to the difference of electric potential between two points on a conducting wire carrying a constant current of one ampere when the power dissipated between the points is one watt.
Van De Graff Generator: An electrostatic generator in which an electric charge is either removed from or transferred to a large hollow spherical electrode by a rapidly moving belt, accelerating particles to energies of about ten million electron volts
Capacitor: An electric circuit element used to store charge temporarily, consisting in general of two metallic plates separated and insulated from each other by a dialect
Electric Fields
When the present of a electric particle is present it produces a force on all other particles around it. All of the particles effected, can be influenced by not touching each other. Electric Fields are mostly formed by differences in voltage; the higher it is the more powerful it will be. The direction of the field that is formed, would be exerted towards the the positive charge. The unit that is used to measure it, is called Joule. A positive field moves away from the particle, a negative moves towards it. Lines of force coming out of the field are called field lines. Field lines start on positive and ends on negative charges, and the direction of the field lines at a point, tells you what direction the force experienced by a charge at a point.
Image Courtsey of: University of Delware Physics Department
Electric Field lines, are the lines of a positive and negative charge. Electric field lines are also used to show electric fields, they also show space, and how the field affects the space around the field, and because of that reason they determine the magnitude, as well as the direction, of the whole electric field that was formed. The field lines associated with a positive point charge are a set of uneven, unbroken lines from the positive charge. They usually are seen with arrows pointing in the direction and strength of the electric field. The presence of a few lines around a charge is usually sufficient to convey a nature of the electric field in the space surrounding the space. When the field lines are closer the field is virtually unbreakable, but when there apart it makes the brittle and less powerful. You can also visualise an electric field by using field vectors. The larger the charge the more field lines they have beginning and ending on them. The field lines will never cross (E is absoulte zero). [1] [10] [11] [12] [13]
Electric Shielding
Electromagnetic shielding is the process of stopping the movement of a electric field in space. When an electric field is moving through space, and it hits an electric sheild, it does two things: deflects most of it, and then the rest is observed by the actual sheilding. The only electric energy that goes through is residual. When analyazing electric sheilding you need to know what the three different fields are. The first is the plain wave, (its exists only from about 1/6th of the wavelength from source). The second type is an Electric Field, most of its energy dominates, in the near field, the losses of energy are greater because of the higher wave impendance. This is why it is possible to be able to use shields, to protect from the fields. The third field is the magnetic field, if your close to the low-impedance source, inductive energy predominates. The most common types of shielding used are Steel and Aluminum, most high frencquence fields can be shielded by aluminum, the low one can only be used with steel. Most of the electric particles come from various electric fields, Most low-frequences, and static energy, can be shielded by using any piece of metal or aluminum, but the higher-frequency electric fields,need something bigger and more powerful.[2] [3]
Electric Fields and Potential
What Are Electric Fields?
Table of Contents
What is Electric Potential
Electric Potential is an idea from Electrostatics, it can be described as the capcity for doing work, which arises from the position or configuration of the particles. The units are called Vouls or Voltage (named after Alessandro Volta) as we know them. It is usually compared to gravity and mass. Another energy that is used, usually has to do with energy moving with a charge from one place to another. It is defined by a source that is multiplied by the force that is applied. The steeper the potential, the higher the electric field becomes. Potential also has regions which are know as equipotentials, which is the constant value. It can usually be calculated by the point charge expression.[5] [8] [9]
Vocabulary
Electric Fields
When the present of a electric particle is present it produces a force on all other particles around it. All of the particles effected, can be influenced by not touching each other. Electric Fields are mostly formed by differences in voltage; the higher it is the more powerful it will be. The direction of the field that is formed, would be exerted towards the the positive charge. The unit that is used to measure it, is called Joule. A positive field moves away from the particle, a negative moves towards it. Lines of force coming out of the field are called field lines. Field lines start on positive and ends on negative charges, and the direction of the field lines at a point, tells you what direction the force experienced by a charge at a point.
Electric Shielding
Electromagnetic shielding is the process of stopping the movement of a electric field in space. When an electric field is moving through space, and it hits an electric sheild, it does two things: deflects most of it, and then the rest is observed by the actual sheilding. The only electric energy that goes through is residual. When analyazing electric sheilding you need to know what the three different fields are. The first is the plain wave, (its exists only from about 1/6th of the wavelength from source). The second type is an Electric Field, most of its energy dominates, in the near field, the losses of energy are greater because of the higher wave impendance. This is why it is possible to be able to use shields, to protect from the fields. The third field is the magnetic field, if your close to the low-impedance source, inductive energy predominates. The most common types of shielding used are Steel and Aluminum, most high frencquence fields can be shielded by aluminum, the low one can only be used with steel. Most of the electric particles come from various electric fields, Most low-frequences, and static energy, can be shielded by using any piece of metal or aluminum, but the higher-frequency electric fields,need something bigger and more powerful.[2] [3]
References
1. http://farside.ph.utexas.edu/teaching/316/lectures/node23.html
2. http://svconline.com/news/avinstall_shielding/
3. http://silencingthefields.com/shielding.html
4. http://library.thinkquest.org/10796/ch12/ch12.htm
5. http://www.physicsclassroom.com/CLASS/circuits/u9l1b.cfm
6. http://hyperphysics.phy-astr.gsu.edu/HBASE/electric/elefie.html
7. http://mrmacphysics.wikispaces.com/file/view/AP+Ch.+20+Notes.ppt
8. http://library.thinkquest.org/10784/phys4.html
9. http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/info/earth/elec_pot/elec_pot.htm
10. http://physics.bu.edu/~duffy/py106/Electricfield.html
11. http://teacher.nsrl.rochester.edu/phy122/Lecture_Notes/Chapter23/Chapter23.html
12. http://hyperphysics.phy-astr.gsu.edu/HBASE/electric/elelin.html
13. http://www.pa.msu.edu/courses/2000spring/PHY232/lectures/efields/efieldlines.html